Question 1 A Y-connected synchronous generator has sequence reactance of Xo = 0.1pu; X1 = 0.22pu and X2 = 0.36pu. The neutral point of the generator is grounded through a reactance of 0.1pu. The generator is running at no load with rated terminal voltage when it suffers and unbalanced fault The fault currents out of the generator are la = 0, I, = 4.22150° and I, = 4.2430°, all in per unit with respect to phase a line to neutral voltage. Determine: 1.1 %3D %3D %3D %3D 1.1.1 The terminal voltage in each phase of the generator with respect to ground. 1.1.2 The voltage of the neutral point of the generator with respect to ground. 1.1.3 1.1.3 The nature (type) of the fault from the results of 1.1 above.

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Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.